Problems
LinkedList Distance to Cycle
LinkedList Distance to Cycle
Given a linked list. Find the distance from the head of the list to the node where cycle starts. If there is no cycle, return -1.
Definition of a single linked list:
// Java
class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
next = null;
}
}
// C++
class ListNode
{
public:
int val;
ListNode *next;
ListNode(int x) : val(x), next(NULL) {}
};
// C
struct ListNode
{
int val;
struct ListNode *next;
};
Implement a function DistanceToCycle that returns the distance from the head of the list to the node where cycle starts. If there is no cycle, return -1.
// Java
int DistanceToCycle(ListNode head)
// C, C++
int DistanceToCycle(ListNode *head)
Example
Function DistanceToCycle returns -1 because this linked list does not contain a cycle.
Function DistanceToCycle returns 2 - the distance from the head of the list to the node where cycle starts. (1 → 2 → 3).